Bayern Munich could reportedly sell Robert Lewandowski and Arturo Vidal this summer and are considering Antoine Griezmann, Paulo Dybala or Anthony Martial as a potential replacement.

The two stars are key players for Bayern, but the club may sell as they attempt to revamp their squad with a view to winning the UEFA Champions League, per Kaustubh Pandey at Calciomercato.com.

There will be changes at the club next season, as they have already confirmed Niko Kovac will replace Jupp Heynckes as manager. Bayern have also signed midfielder Leon Goretzka from Schalke, and he will join the club in July.

Lewandowski's future has been the subject of much speculation, and he has been linked with a move to Real Madrid. The Poland international has been pushing for a move to the Santiago Bernabeu, according to Marca's Jose Felix Diaz.

Dugout showed just how prolific a striker Lewandowski is:

Dugout @Dugout

Robert Lewandowski has scored 40+ goals for @FCBayern in each of the last three seasons across all competitions:
2015/16: 42 ⚽
2016/17: 43 ⚽
2017/18: 40 ⚽ https://t.co/VmncpqeP6G

Real Madrid knocked Bayern Munich out of this season's Champions League, and Lewandowski failed to impress in either of the two legs of the semi-final.

Squawka Football showed his record in the tournament:

Squawka Football @Squawka

Robert Lewandowski has failed to score in each of his last five Champions League games:
❌ vs. Besiktas
❌ vs. Sevilla
❌ vs. Sevilla
❌ vs. Real Madrid
❌ vs. Real Madrid
13 shots in total (unlucky for some). https://t.co/NaAxCezTIF

Sports writer Andy West said he'd let his team down:

Andy West @andywest01

Muller and Lewandowski really letting Bayern down, in both legs.

Lewandowski joined Bayern from Borussia Dortmund in 2014 with the aim of establishing the club among Europe's elite. Yet while the club have dominated the Bundesliga, they have not been able to win the Champions League.

Vidal is another player whose future at the club appears uncertain. A knee injury ended his season prematurely and could also affect his future, per Kicker (h/t Mark Lovell at ESPN FC):

Mark Lovell @LovellLowdown

kicker suggest Arturo Vidal's long-term knee injury will eat into prep for next season, meaning interested clubs (Chelsea) may prefer to wait, while Bayern also wary about offering fresh deal for @kingarturo23 who turns 31 this month.

This summer does appear to be one of transition for Bayern with Kovac coming in. There's no doubting the quality of Lewandowski and Vidal, but Bayern may decide this is the right time to move them on and bring in younger alternatives.